svn commit: r235044 - in projects/altix2/sys: kern sys
Marcel Moolenaar
marcel at FreeBSD.org
Sat May 5 00:08:05 UTC 2012
Author: marcel
Date: Sat May 5 00:08:05 2012
New Revision: 235044
URL: http://svn.freebsd.org/changeset/base/235044
Log:
Start afresh with busdma_tag_create. Commit the skeleton to build
history.
Added:
projects/altix2/sys/sys/busdma.h (contents, props changed)
Modified:
projects/altix2/sys/kern/subr_busdma.c
Modified: projects/altix2/sys/kern/subr_busdma.c
==============================================================================
--- projects/altix2/sys/kern/subr_busdma.c Fri May 4 23:45:34 2012 (r235043)
+++ projects/altix2/sys/kern/subr_busdma.c Sat May 5 00:08:05 2012 (r235044)
@@ -1,28 +1,27 @@
/*-
- * Copyright (c) 2010 Marcel Moolenaar
- * Copyright (c) 1997, 1998 Justin T. Gibbs.
+ * Copyright (c) 2012 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
+ *
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions, and the following disclaimer,
- * without modification, immediately at the beginning of the file.
- * 2. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
*
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
- * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
@@ -30,1208 +29,19 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/bus.h>
-#include <sys/interrupt.h>
#include <sys/kernel.h>
-#include <sys/ktr.h>
-#include <sys/lock.h>
-#include <sys/proc.h>
-#include <sys/mutex.h>
-#include <sys/mbuf.h>
-#include <sys/uio.h>
-#include <sys/sysctl.h>
-
-#include <vm/vm.h>
-#include <vm/vm_page.h>
-#include <vm/vm_map.h>
-
-#include <machine/atomic.h>
-#include <machine/bus.h>
-#include <machine/md_var.h>
-
-#define BUS_DMA_COULD_BOUNCE BUS_DMA_BUS3
-#define BUS_DMA_MIN_ALLOC_COMP BUS_DMA_BUS4
-
-struct bounce_zone;
-
-struct bus_dma_tag {
- bus_dma_tag_t parent;
- bus_size_t alignment;
- bus_addr_t boundary;
- bus_addr_t lowaddr;
- bus_addr_t highaddr;
- bus_dma_filter_t *filter;
- void *filterarg;
- bus_size_t maxsize;
- u_int nsegments;
- bus_size_t maxsegsz;
- int flags;
- int ref_count;
- int map_count;
- bus_dma_lock_t *lockfunc;
- void *lockfuncarg;
- bus_dma_segment_t *segments;
- struct bounce_zone *bounce_zone;
-};
-
-struct bounce_page {
- vm_offset_t vaddr; /* kva of bounce buffer */
- bus_addr_t busaddr; /* Physical address */
- vm_offset_t datavaddr; /* kva of client data */
- bus_size_t datacount; /* client data count */
- STAILQ_ENTRY(bounce_page) links;
-};
-
-int busdma_swi_pending;
-
-struct bounce_zone {
- STAILQ_ENTRY(bounce_zone) links;
- STAILQ_HEAD(bp_list, bounce_page) bounce_page_list;
- int total_bpages;
- int free_bpages;
- int reserved_bpages;
- int active_bpages;
- int total_bounced;
- int total_deferred;
- int map_count;
- bus_size_t alignment;
- bus_addr_t lowaddr;
- char zoneid[8];
- char lowaddrid[20];
- struct sysctl_ctx_list sysctl_tree;
- struct sysctl_oid *sysctl_tree_top;
-};
-
-static struct mtx bounce_lock;
-static int total_bpages;
-static int busdma_zonecount;
-static STAILQ_HEAD(, bounce_zone) bounce_zone_list;
-
-static SYSCTL_NODE(_hw, OID_AUTO, busdma, CTLFLAG_RD, 0, "Busdma parameters");
-SYSCTL_INT(_hw_busdma, OID_AUTO, total_bpages, CTLFLAG_RD, &total_bpages, 0,
- "Total bounce pages");
+#include <sys/bus.h>
+#include <sys/busdma.h>
-struct bus_dmamap {
- struct bp_list bpages;
- int pagesneeded;
- int pagesreserved;
- bus_dma_tag_t dmat;
- void *buf; /* unmapped buffer pointer */
- bus_size_t buflen; /* unmapped buffer length */
- bus_dmamap_callback_t *callback;
- void *callback_arg;
- STAILQ_ENTRY(bus_dmamap) links;
+struct busdma_tag {
+ device_t dt_device;
};
-static STAILQ_HEAD(, bus_dmamap) bounce_map_waitinglist;
-static STAILQ_HEAD(, bus_dmamap) bounce_map_callbacklist;
-static struct bus_dmamap nobounce_dmamap;
-
-static void init_bounce_pages(void *dummy);
-static int alloc_bounce_zone(bus_dma_tag_t dmat);
-static int alloc_bounce_pages(bus_dma_tag_t dmat, u_int numpages);
-static int reserve_bounce_pages(bus_dma_tag_t dmat, bus_dmamap_t map,
- int commit);
-static bus_addr_t add_bounce_page(bus_dma_tag_t dmat, bus_dmamap_t map,
- vm_offset_t vaddr, bus_size_t size);
-static void free_bounce_page(bus_dma_tag_t dmat, struct bounce_page *bpage);
-static __inline int run_filter(bus_dma_tag_t dmat, bus_addr_t paddr);
-
-#ifdef XEN
-#undef pmap_kextract
-#define pmap_kextract pmap_kextract_ma
-#endif
-
-static void
-warn_null_map(const char *func, void *caller)
-{
- static struct timeval lastfail;
- static int curfail;
-
- if (!ppsratecheck(&lastfail, &curfail, 1))
- return;
-
- printf("WARNING: %s called with NULL map from %p\n", func, caller);
-}
-
-/*
- * Return true if a match is made.
- *
- * To find a match walk the chain of bus_dma_tag_t's looking for 'paddr'.
- *
- * If paddr is within the bounds of the dma tag then call the filter callback
- * to check for a match, if there is no filter callback then assume a match.
- */
-static __inline int
-run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
-{
- int retval;
-
- retval = 0;
- do {
- if (((paddr > dmat->lowaddr && paddr <= dmat->highaddr) ||
- (paddr & (dmat->alignment - 1)) != 0) &&
- (dmat->filter == NULL ||
- (*dmat->filter)(dmat->filterarg, paddr) != 0))
- retval = 1;
-
- dmat = dmat->parent;
- } while (retval == 0 && dmat != NULL);
-
- return (retval);
-}
-
-/*
- * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example). Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg. Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
- */
-void
-busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
-{
- struct mtx *dmtx;
-
- dmtx = (struct mtx *)arg;
- switch (op) {
- case BUS_DMA_LOCK:
- mtx_lock(dmtx);
- break;
- case BUS_DMA_UNLOCK:
- mtx_unlock(dmtx);
- break;
- default:
- panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
- }
-}
-
-/*
- * dflt_lock should never get called. It gets put into the dma tag when
- * lockfunc == NULL, which is only valid if the maps that are associated
- * with the tag are meant to never be defered.
- * XXX Should have a way to identify which driver is responsible here.
- */
-static void
-dflt_lock(void *arg, bus_dma_lock_op_t op)
-{
- panic("driver error: busdma dflt_lock called");
-}
-
-/*
- * Allocate a device specific dma_tag.
- */
-int
-bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
- bus_addr_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
- bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
- int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
- void *lockfuncarg, bus_dma_tag_t *dmat)
-{
- bus_dma_tag_t newtag;
- int error = 0;
-
- /* Let MD code handle API flaws. */
- parent = bus_dma_tag_parent(parent);
-
- /* Basic sanity checking */
- if (boundary != 0 && boundary < maxsegsz)
- maxsegsz = boundary;
-
- if (maxsegsz == 0) {
- return (EINVAL);
- }
-
- /* Return a NULL tag on failure */
- *dmat = NULL;
-
- newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF,
- M_ZERO | M_NOWAIT);
- if (newtag == NULL) {
- CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
- __func__, newtag, 0, error);
- return (ENOMEM);
- }
-
- newtag->parent = parent;
- newtag->alignment = alignment;
- newtag->boundary = boundary;
- newtag->lowaddr = trunc_page((vm_paddr_t)lowaddr) + (PAGE_SIZE - 1);
- newtag->highaddr = trunc_page((vm_paddr_t)highaddr) + (PAGE_SIZE - 1);
- newtag->filter = filter;
- newtag->filterarg = filterarg;
- newtag->maxsize = maxsize;
- newtag->nsegments = nsegments;
- newtag->maxsegsz = maxsegsz;
- newtag->flags = flags;
- newtag->ref_count = 1; /* Count ourself */
- newtag->map_count = 0;
- if (lockfunc != NULL) {
- newtag->lockfunc = lockfunc;
- newtag->lockfuncarg = lockfuncarg;
- } else {
- newtag->lockfunc = dflt_lock;
- newtag->lockfuncarg = NULL;
- }
- newtag->segments = NULL;
-
- /* Take into account any restrictions imposed by our parent tag */
- if (parent != NULL) {
- newtag->lowaddr = MIN(parent->lowaddr, newtag->lowaddr);
- newtag->highaddr = MAX(parent->highaddr, newtag->highaddr);
- if (newtag->boundary == 0)
- newtag->boundary = parent->boundary;
- else if (parent->boundary != 0)
- newtag->boundary = MIN(parent->boundary,
- newtag->boundary);
- if (newtag->filter != NULL ||
- (parent->flags & BUS_DMA_COULD_BOUNCE) != 0)
- newtag->flags |= BUS_DMA_COULD_BOUNCE;
- if (newtag->filter == NULL) {
- /*
- * Short circuit looking at our parent directly
- * since we have encapsulated all of its information
- */
- newtag->filter = parent->filter;
- newtag->filterarg = parent->filterarg;
- newtag->parent = parent->parent;
- }
- if (newtag->parent != NULL)
- atomic_add_int(&parent->ref_count, 1);
- }
-
- if (newtag->lowaddr < ptoa((vm_paddr_t)Maxmem) ||
- newtag->alignment > 1)
- newtag->flags |= BUS_DMA_COULD_BOUNCE;
-
- if (((newtag->flags & BUS_DMA_COULD_BOUNCE) != 0) &&
- (flags & BUS_DMA_ALLOCNOW) != 0) {
- struct bounce_zone *bz;
-
- /* Must bounce */
-
- if ((error = alloc_bounce_zone(newtag)) != 0) {
- free(newtag, M_DEVBUF);
- return (error);
- }
- bz = newtag->bounce_zone;
-
- if (ptoa(bz->total_bpages) < maxsize) {
- int pages;
-
- pages = atop(maxsize) - bz->total_bpages;
-
- /* Add pages to our bounce pool */
- if (alloc_bounce_pages(newtag, pages) < pages)
- error = ENOMEM;
- }
- /* Performed initial allocation */
- newtag->flags |= BUS_DMA_MIN_ALLOC_COMP;
- }
-
- if (error != 0) {
- free(newtag, M_DEVBUF);
- } else {
- *dmat = newtag;
- }
- CTR4(KTR_BUSDMA, "%s returned tag %p tag flags 0x%x error %d",
- __func__, newtag, (newtag != NULL ? newtag->flags : 0), error);
- return (error);
-}
-
-int
-bus_dma_tag_destroy(bus_dma_tag_t dmat)
-{
- bus_dma_tag_t dmat_copy;
- int error;
-
- error = 0;
- dmat_copy = dmat;
-
- if (dmat != NULL) {
-
- if (dmat->map_count != 0) {
- error = EBUSY;
- goto out;
- }
-
- while (dmat != NULL) {
- bus_dma_tag_t parent;
-
- parent = dmat->parent;
- atomic_subtract_int(&dmat->ref_count, 1);
- if (dmat->ref_count == 0) {
- if (dmat->segments != NULL)
- free(dmat->segments, M_DEVBUF);
- free(dmat, M_DEVBUF);
- /*
- * Last reference count, so
- * release our reference
- * count on our parent.
- */
- dmat = parent;
- } else
- dmat = NULL;
- }
- }
-
-out:
- CTR3(KTR_BUSDMA, "%s tag %p error %d", __func__, dmat_copy, error);
- return (error);
-}
-
-/*
- * Allocate a handle for mapping from kva/uva/physical
- * address space into bus device space.
- */
-int
-bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
-{
- int error;
-
- error = 0;
-
- if (dmat->segments == NULL) {
- dmat->segments = (bus_dma_segment_t *)malloc(
- sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF,
- M_NOWAIT);
- if (dmat->segments == NULL) {
- CTR3(KTR_BUSDMA, "%s: tag %p error %d",
- __func__, dmat, ENOMEM);
- return (ENOMEM);
- }
- }
-
- /*
- * Bouncing might be required if the driver asks for an active
- * exclusion region, a data alignment that is stricter than 1, and/or
- * an active address boundary.
- */
- if (dmat->flags & BUS_DMA_COULD_BOUNCE) {
-
- /* Must bounce */
- struct bounce_zone *bz;
- int maxpages;
-
- if (dmat->bounce_zone == NULL) {
- if ((error = alloc_bounce_zone(dmat)) != 0)
- return (error);
- }
- bz = dmat->bounce_zone;
-
- *mapp = (bus_dmamap_t)malloc(sizeof(**mapp), M_DEVBUF,
- M_NOWAIT | M_ZERO);
- if (*mapp == NULL) {
- CTR3(KTR_BUSDMA, "%s: tag %p error %d",
- __func__, dmat, ENOMEM);
- return (ENOMEM);
- }
-
- /* Initialize the new map */
- STAILQ_INIT(&((*mapp)->bpages));
-
- /*
- * Attempt to add pages to our pool on a per-instance
- * basis up to a sane limit.
- */
- if (dmat->alignment > 1)
- maxpages = BUSDMA_MAX_BPAGES;
- else
- maxpages = MIN(BUSDMA_MAX_BPAGES,
- Maxmem - atop(dmat->lowaddr));
- if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0 ||
- (bz->map_count > 0 && bz->total_bpages < maxpages)) {
- int pages;
-
- pages = MAX(atop(dmat->maxsize), 1);
- pages = MIN(maxpages - bz->total_bpages, pages);
- pages = MAX(pages, 1);
- if (alloc_bounce_pages(dmat, pages) < pages)
- error = ENOMEM;
-
- if ((dmat->flags & BUS_DMA_MIN_ALLOC_COMP) == 0) {
- if (error == 0)
- dmat->flags |= BUS_DMA_MIN_ALLOC_COMP;
- } else {
- error = 0;
- }
- }
- bz->map_count++;
- } else {
- *mapp = NULL;
- }
- if (error == 0)
- dmat->map_count++;
- CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
- __func__, dmat, dmat->flags, error);
- return (error);
-}
-
-/*
- * Destroy a handle for mapping from kva/uva/physical
- * address space into bus device space.
- */
-int
-bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
-{
- if (map != NULL && map != &nobounce_dmamap) {
- if (STAILQ_FIRST(&map->bpages) != NULL) {
- CTR3(KTR_BUSDMA, "%s: tag %p error %d",
- __func__, dmat, EBUSY);
- return (EBUSY);
- }
- if (dmat->bounce_zone)
- dmat->bounce_zone->map_count--;
- free(map, M_DEVBUF);
- }
- dmat->map_count--;
- CTR2(KTR_BUSDMA, "%s: tag %p error 0", __func__, dmat);
- return (0);
-}
-
-
-/*
- * Allocate a piece of memory that can be efficiently mapped into
- * bus device space based on the constraints lited in the dma tag.
- * A dmamap to for use with dmamap_load is also allocated.
- */
-int
-bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
- bus_dmamap_t *mapp)
-{
- int mflags;
-
- if (flags & BUS_DMA_NOWAIT)
- mflags = M_NOWAIT;
- else
- mflags = M_WAITOK;
-
- /* If we succeed, no mapping/bouncing will be required */
- *mapp = NULL;
-
- if (dmat->segments == NULL) {
- dmat->segments = (bus_dma_segment_t *)malloc(
- sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF,
- mflags);
- if (dmat->segments == NULL) {
- CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
- __func__, dmat, dmat->flags, ENOMEM);
- return (ENOMEM);
- }
- }
- if (flags & BUS_DMA_ZERO)
- mflags |= M_ZERO;
-
- /*
- * XXX:
- * (dmat->alignment < dmat->maxsize) is just a quick hack; the exact
- * alignment guarantees of malloc need to be nailed down, and the
- * code below should be rewritten to take that into account.
- *
- * In the meantime, we'll warn the user if malloc gets it wrong.
- */
- if ((dmat->maxsize <= PAGE_SIZE) &&
- (dmat->alignment < dmat->maxsize) &&
- dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem)) {
- *vaddr = malloc(dmat->maxsize, M_DEVBUF, mflags);
- } else {
- /*
- * XXX Use Contigmalloc until it is merged into this facility
- * and handles multi-seg allocations. Nobody is doing
- * multi-seg allocations yet though.
- * XXX Certain AGP hardware does.
- */
- *vaddr = contigmalloc(dmat->maxsize, M_DEVBUF, mflags, 0ul,
- dmat->lowaddr, dmat->alignment ? dmat->alignment : 1ul,
- dmat->boundary);
- }
- if (*vaddr == NULL) {
- CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
- __func__, dmat, dmat->flags, ENOMEM);
- return (ENOMEM);
- } else if (vtophys(*vaddr) & (dmat->alignment - 1)) {
- printf("bus_dmamem_alloc failed to align memory properly.\n");
- }
-#if defined(__amd64__) || defined(__i386__)
- if (flags & BUS_DMA_NOCACHE)
- pmap_change_attr((vm_offset_t)*vaddr, dmat->maxsize,
- PAT_UNCACHEABLE);
-#endif
- CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d",
- __func__, dmat, dmat->flags, 0);
- return (0);
-}
-
-/*
- * Free a piece of memory and it's allociated dmamap, that was allocated
- * via bus_dmamem_alloc. Make the same choice for free/contigfree.
- */
-void
-bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
-{
- /*
- * dmamem does not need to be bounced, so the map should be
- * NULL
- */
- if (map != NULL)
- panic("bus_dmamem_free: Invalid map freed\n");
-#if defined(__amd64__) || defined(__i386__)
- pmap_change_attr((vm_offset_t)vaddr, dmat->maxsize, PAT_WRITE_BACK);
-#endif
- if ((dmat->maxsize <= PAGE_SIZE) &&
- (dmat->alignment < dmat->maxsize) &&
- dmat->lowaddr >= ptoa((vm_paddr_t)Maxmem))
- free(vaddr, M_DEVBUF);
- else {
- contigfree(vaddr, dmat->maxsize, M_DEVBUF);
- }
- CTR3(KTR_BUSDMA, "%s: tag %p flags 0x%x", __func__, dmat, dmat->flags);
-}
-
-/*
- * Utility function to load a linear buffer. lastaddrp holds state
- * between invocations (for multiple-buffer loads). segp contains
- * the starting segment on entrace, and the ending segment on exit.
- * first indicates if this is the first invocation of this function.
- */
-static __inline int
-_bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
- bus_size_t buflen, pmap_t pmap, int flags, bus_addr_t *lastaddrp,
- bus_dma_segment_t *segs, int *segp, int first)
-{
- bus_size_t sgsize;
- bus_addr_t curaddr, lastaddr, baddr, bmask;
- vm_offset_t vaddr;
- bus_addr_t paddr;
- int seg;
-
- if (map == NULL)
- map = &nobounce_dmamap;
-
- if ((map != &nobounce_dmamap && map->pagesneeded == 0) &&
- ((dmat->flags & BUS_DMA_COULD_BOUNCE) != 0)) {
- vm_offset_t vendaddr;
-
- CTR4(KTR_BUSDMA, "lowaddr= %d Maxmem= %d, boundary= %d, "
- "alignment= %lu", dmat->lowaddr, ptoa((vm_paddr_t)Maxmem),
- dmat->boundary, (u_long)dmat->alignment);
- CTR3(KTR_BUSDMA, "map= %p, nobouncemap= %p, pagesneeded= %d",
- map, &nobounce_dmamap, map->pagesneeded);
- /*
- * Count the number of bounce pages
- * needed in order to complete this transfer
- */
- vaddr = (vm_offset_t)buf;
- vendaddr = (vm_offset_t)buf + buflen;
-
- while (vaddr < vendaddr) {
- bus_size_t sg_len;
-
- sg_len = PAGE_SIZE - ((vm_offset_t)vaddr & PAGE_MASK);
- if (pmap)
- paddr = pmap_extract(pmap, vaddr);
- else
- paddr = pmap_kextract(vaddr);
- if (run_filter(dmat, paddr) != 0) {
- sg_len = roundup2(sg_len, dmat->alignment);
- map->pagesneeded++;
- }
- vaddr += sg_len;
- }
- CTR1(KTR_BUSDMA, "pagesneeded= %d\n", map->pagesneeded);
- }
-
- /* Reserve Necessary Bounce Pages */
- if (map->pagesneeded != 0) {
- mtx_lock(&bounce_lock);
- if (flags & BUS_DMA_NOWAIT) {
- if (reserve_bounce_pages(dmat, map, 0) != 0) {
- mtx_unlock(&bounce_lock);
- return (ENOMEM);
- }
- } else {
- if (reserve_bounce_pages(dmat, map, 1) != 0) {
- /* Queue us for resources */
- map->dmat = dmat;
- map->buf = buf;
- map->buflen = buflen;
- STAILQ_INSERT_TAIL(&bounce_map_waitinglist,
- map, links);
- mtx_unlock(&bounce_lock);
- return (EINPROGRESS);
- }
- }
- mtx_unlock(&bounce_lock);
- }
-
- vaddr = (vm_offset_t)buf;
- lastaddr = *lastaddrp;
- bmask = ~(dmat->boundary - 1);
-
- for (seg = *segp; buflen > 0 ; ) {
- bus_size_t max_sgsize;
-
- /*
- * Get the physical address for this segment.
- */
- if (pmap)
- curaddr = pmap_extract(pmap, vaddr);
- else
- curaddr = pmap_kextract(vaddr);
-
- /*
- * Compute the segment size, and adjust counts.
- */
- max_sgsize = MIN(buflen, dmat->maxsegsz);
- sgsize = PAGE_SIZE - ((vm_offset_t)curaddr & PAGE_MASK);
- if (map->pagesneeded != 0 && run_filter(dmat, curaddr)) {
- sgsize = roundup2(sgsize, dmat->alignment);
- sgsize = MIN(sgsize, max_sgsize);
- curaddr = add_bounce_page(dmat, map, vaddr, sgsize);
- } else {
- sgsize = MIN(sgsize, max_sgsize);
- }
-
- /*
- * Make sure we don't cross any boundaries.
- */
- if (dmat->boundary > 0) {
- baddr = (curaddr + dmat->boundary) & bmask;
- if (sgsize > (baddr - curaddr))
- sgsize = (baddr - curaddr);
- }
-
- /*
- * Insert chunk into a segment, coalescing with
- * previous segment if possible.
- */
- if (first) {
- segs[seg].ds_addr = curaddr;
- segs[seg].ds_len = sgsize;
- first = 0;
- } else {
- if (curaddr == lastaddr &&
- (segs[seg].ds_len + sgsize) <= dmat->maxsegsz &&
- (dmat->boundary == 0 ||
- (segs[seg].ds_addr & bmask) == (curaddr & bmask)))
- segs[seg].ds_len += sgsize;
- else {
- if (++seg >= dmat->nsegments)
- break;
- segs[seg].ds_addr = curaddr;
- segs[seg].ds_len = sgsize;
- }
- }
-
- lastaddr = curaddr + sgsize;
- vaddr += sgsize;
- buflen -= sgsize;
- }
-
- *segp = seg;
- *lastaddrp = lastaddr;
-
- /*
- * Did we fit?
- */
- return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
-}
-
-/*
- * Map the buffer buf into bus space using the dmamap map.
- */
-int
-bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
- bus_size_t buflen, bus_dmamap_callback_t *callback, void *callback_arg,
- int flags)
-{
- bus_addr_t lastaddr = 0;
- int error, nsegs = 0;
-
- if (map != NULL) {
- flags |= BUS_DMA_WAITOK;
- map->callback = callback;
- map->callback_arg = callback_arg;
- }
-
- error = _bus_dmamap_load_buffer(dmat, map, buf, buflen, NULL, flags,
- &lastaddr, dmat->segments, &nsegs, 1);
-
- CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
- __func__, dmat, dmat->flags, error, nsegs + 1);
-
- if (error == EINPROGRESS) {
- return (error);
- }
-
- if (error)
- (*callback)(callback_arg, dmat->segments, 0, error);
- else
- (*callback)(callback_arg, dmat->segments, nsegs + 1, 0);
-
- /*
- * Return ENOMEM to the caller so that it can pass it up the stack.
- * This error only happens when NOWAIT is set, so deferal is disabled.
- */
- if (error == ENOMEM)
- return (error);
-
- return (0);
-}
-
-
-/*
- * Like _bus_dmamap_load(), but for mbufs.
- */
-int
-bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
- bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
-{
- int nsegs, error;
-
- M_ASSERTPKTHDR(m0);
-
- flags |= BUS_DMA_NOWAIT;
- nsegs = 0;
- error = 0;
- if (m0->m_pkthdr.len <= dmat->maxsize) {
- int first = 1;
- bus_addr_t lastaddr = 0;
- struct mbuf *m;
-
- for (m = m0; m != NULL && error == 0; m = m->m_next) {
- if (m->m_len > 0) {
- error = _bus_dmamap_load_buffer(dmat, map,
- m->m_data, m->m_len,
- NULL, flags, &lastaddr,
- dmat->segments, &nsegs, first);
- first = 0;
- }
- }
- } else {
- error = EINVAL;
- }
-
- if (error) {
- /* force "no valid mappings" in callback */
- (*callback)(callback_arg, dmat->segments, 0, 0, error);
- } else {
- (*callback)(callback_arg, dmat->segments,
- nsegs+1, m0->m_pkthdr.len, error);
- }
- CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
- __func__, dmat, dmat->flags, error, nsegs + 1);
- return (error);
-}
-
-int
-bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
- bus_dma_segment_t *segs, int *nsegs, int flags)
-{
- int error;
-
- M_ASSERTPKTHDR(m0);
-
- flags |= BUS_DMA_NOWAIT;
- *nsegs = 0;
- error = 0;
- if (m0->m_pkthdr.len <= dmat->maxsize) {
- int first = 1;
- bus_addr_t lastaddr = 0;
- struct mbuf *m;
-
- for (m = m0; m != NULL && error == 0; m = m->m_next) {
- if (m->m_len > 0) {
- error = _bus_dmamap_load_buffer(dmat, map,
- m->m_data, m->m_len,
- NULL, flags, &lastaddr,
- segs, nsegs, first);
- first = 0;
- }
- }
- } else {
- error = EINVAL;
- }
-
- /* XXX FIXME: Having to increment nsegs is really annoying */
- ++*nsegs;
- CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
- __func__, dmat, dmat->flags, error, *nsegs);
- return (error);
-}
-
-/*
- * Like _bus_dmamap_load(), but for uios.
- */
int
-bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
- bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
-{
- bus_addr_t lastaddr = 0;
- int nsegs, error, first, i;
- bus_size_t resid;
- struct iovec *iov;
- pmap_t pmap;
-
- flags |= BUS_DMA_NOWAIT;
- resid = uio->uio_resid;
- iov = uio->uio_iov;
-
- if (uio->uio_segflg == UIO_USERSPACE) {
- KASSERT(uio->uio_td != NULL,
- ("bus_dmamap_load_uio: USERSPACE but no proc"));
- pmap = vmspace_pmap(uio->uio_td->td_proc->p_vmspace);
- } else
- pmap = NULL;
-
- nsegs = 0;
- error = 0;
- first = 1;
- for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
- /*
- * Now at the first iovec to load. Load each iovec
- * until we have exhausted the residual count.
- */
- bus_size_t minlen =
- resid < iov[i].iov_len ? resid : iov[i].iov_len;
- caddr_t addr = (caddr_t) iov[i].iov_base;
-
- if (minlen > 0) {
- error = _bus_dmamap_load_buffer(dmat, map,
- addr, minlen, pmap, flags, &lastaddr,
- dmat->segments, &nsegs, first);
- first = 0;
-
- resid -= minlen;
- }
- }
-
- if (error) {
- /* force "no valid mappings" in callback */
- (*callback)(callback_arg, dmat->segments, 0, 0, error);
- } else {
- (*callback)(callback_arg, dmat->segments,
- nsegs+1, uio->uio_resid, error);
- }
- CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
- __func__, dmat, dmat->flags, error, nsegs + 1);
- return (error);
-}
-
-/*
- * Release the mapping held by map.
- */
-void
-bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
-{
- struct bounce_page *bpage;
-
- if (map == NULL) {
- if (bootverbose)
- warn_null_map(__func__, __builtin_return_address(0));
- return;
- }
-
- while ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
- STAILQ_REMOVE_HEAD(&map->bpages, links);
- free_bounce_page(dmat, bpage);
- }
-}
-
-void
-bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
-{
- struct bounce_page *bpage;
-
- if (map == NULL) {
- if (bootverbose)
- warn_null_map(__func__, __builtin_return_address(0));
- return;
- }
-
- if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
- /*
- * Handle data bouncing. We might also
- * want to add support for invalidating
- * the caches on broken hardware
- */
- CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x "
- "performing bounce", __func__, op, dmat, dmat->flags);
-
- if (op & BUS_DMASYNC_PREWRITE) {
- while (bpage != NULL) {
- bcopy((void *)bpage->datavaddr,
- (void *)bpage->vaddr,
- bpage->datacount);
- bpage = STAILQ_NEXT(bpage, links);
- }
- dmat->bounce_zone->total_bounced++;
- }
-
- if (op & BUS_DMASYNC_POSTREAD) {
- while (bpage != NULL) {
- bcopy((void *)bpage->vaddr,
- (void *)bpage->datavaddr,
- bpage->datacount);
- bpage = STAILQ_NEXT(bpage, links);
- }
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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